avoid stdout redirection on curl executions

Avoid redirecting the curl output directly to the stdout. This alteration
affects the integrity of the file during the retry process, as it also redirects
the logs from the retries. Consequently, this leads to the bootstrap process failing
because of an invalid checksum.

Signed-off-by: onur-ozkan <work@onurozkan.dev>

Author: onur-ozkan

src/bootstrap/bootstrap.py

@@ -104,16 +104,15 @@ def _download(path, url, probably_big, verbose, exception):
         # If curl is not present on Win32, we should not sys.exit
         #   but raise `CalledProcessError` or `OSError` instead
         require(["curl", "--version"], exception=platform_is_win32())
-        with open(path, "wb") as outfile:
-            run(["curl", option,
-                "-L", # Follow redirect.
-                "-y", "30", "-Y", "10",    # timeout if speed is < 10 bytes/sec for > 30 seconds
-                "--connect-timeout", "30",  # timeout if cannot connect within 30 seconds
-                "--retry", "3", "-SRf", url],
-                stdout=outfile,    #Implements cli redirect operator '>'
-                verbose=verbose,
-                exception=True, # Will raise RuntimeError on failure
-            )
+        run(["curl", option,
+            "-L", # Follow redirect.
+            "-y", "30", "-Y", "10",    # timeout if speed is < 10 bytes/sec for > 30 seconds
+            "--connect-timeout", "30",  # timeout if cannot connect within 30 seconds
+            "-o", path,
+            "--retry", "3", "-SRf", url],
+            verbose=verbose,
+            exception=True, # Will raise RuntimeError on failure
+        )
     except (subprocess.CalledProcessError, OSError, RuntimeError):
         # see http://serverfault.com/questions/301128/how-to-download
         if platform_is_win32():

src/bootstrap/download.rs

@@ -216,6 +216,8 @@ impl Config {
             "10", // timeout if speed is < 10 bytes/sec for > 30 seconds
             "--connect-timeout",
             "30", // timeout if cannot connect within 30 seconds
+            "-o",
+            tempfile.to_str().unwrap(),
             "--retry",
             "3",
             "-SRf",
@@ -227,8 +229,6 @@ impl Config {
             curl.arg("--progress-bar");
         }
         curl.arg(url);
-        let f = File::create(tempfile).unwrap();
-        curl.stdout(Stdio::from(f));
         if !self.check_run(&mut curl) {
             if self.build.contains("windows-msvc") {
                 eprintln!("Fallback to PowerShell");